谁能告诉我这是为什么，英语选择题一道(有点难）！ 这是我们作业里的题目，我觉得有点难，实在想不出来，谁能告诉我...
\u6709\u8c01\u80fd\u544a\u8bc9\u6211\u9752\u5c9b\u4e94\u4e2d2010\u5e74\u7684\u5206\u73ed\u8003\u8bd5\u8bd5\u9898\uff1f\u9898\u96be\u5417\uff1f\u91cd\u70b9\u662f\u5c0f\u5b66\u91cc\u8003\u7684\u54ea\u4e9b\u5185\u5bb9\uff1f\u95ee\u7684\u6709\u70b9\u591a\uff0c\u5e2e\u5e2e\u5fd9\u3002\u6211\u4eec\u4e5f\u8981\u8003\uff0c\u8001\u5e08\u8bf4\u8bed\u6587\u4e3b\u8981\u8003\u4e00\u4e9b\u53e4\u8bd7\u3001\u540d\u8a00\u5565\u7684\uff0c\u5c31\u662f\u770b\u4f60\u5e73\u65e5\u7684\u79ef\u7d2f\uff1b\u82f1\u8bed\u4f5c\u6587\u5c31\u662f\u8003\u4f60\u7684\u670b\u53cb\uff0c\u4f60\u5c06\u8981\u5728\u8fd9\u4e2a\u5047\u671f\u505a\u7684\u4e8b\uff0c\u4f60\u7684\u751f\u65e5\u662f\uff08\u5c06\u8981\uff09\u600e\u6837\u5ea6\u8fc7\u7684\uff08\u4e2d\u5b66\u7684\u5df2\u7ecf\u8003\u4e86\uff09\u8fd9\u4e00\u7c7b\u7684\uff1b\u6570\u5b66\u591a\u719f\u6089\u4e00\u4e9b\u9898\u578b\u5c31\u597d\u4e86\uff0c
\u4e0d\u8fc7\u8001\u5e08\u8bf4\u8fd9\u6b21\u8003\u8bd5\u5f88\u91cd\u8981\uff0c\u6240\u4ee5\u8fd8\u662f\u628a\u80fd\u590d\u4e60\u7684\u90fd\u590d\u4e60\u4e86\u597d\u4e86\u3002
\u6211\u4e5f\u5728\u4e94\u4e2d\uff0c\u5e0c\u671b\u80fd\u5206\u5230\u4e00\u4e2a\u73ed\uff01~
(1)\u8bbeX\u5206\u949f\u540e\u76f8\u9047
18.84X+12.56X=100 \u89e3\u5f97X = 100/31.4\u5206\u949f
\u5219\u5c0f\u660e\u6bd4\u5c0f\u6881\u591a\u8d70\u4e86(18.84-12.56)X = 20\u7c73
(2)\u4e0d\u5bf9\uff0c\u8d5a\u548c\u4e8f\u662f\u53c2\u7167\u539f\u4ef7\u6765\u8ba1\u7b97\u7684\uff0c\u5177\u4f53\u5730\u8bf4
\u8bbe\u7532\u5546\u54c1\u539f\u4ef7\u4e3aX\uff0c\u4e59\u5546\u54c1\u539f\u4ef7\u4e3aY
\u52191.2X=60 \u5f97X=50 0.8Y=60 \u5f97Y=75
\u4e5f\u5c31\u662f\u8bf4\uff0c\u7532\u5546\u54c1\u8d5a\u4e8610\u5143\uff0c\u4e59\u5546\u54c1\u4e8f\u4e8615\u5143\uff0c\u51c0\u4e8f\u635f5\u5143
(3)\u8bbe\u6bcf\u5934\u725b\u503cX\u91d1\uff0c\u7f8a\u503cY\u91d1\uff0c\u6709
5X+2Y=10
2X+5Y=8
\u89e3\u65b9\u7a0b\u7ec4\uff0c\u5f97X=34/21\u91d1 Y=20/21\u91d1
(4)\u8bbe\u6709X\u540d\u58eb\u5175\uff0cY\u540d\u519b\u5b98
4Y+0.25X=1000
X+Y=1000
\u89e3\u65b9\u7a0b\u7ec4\uff0c\u5f97Y=200 X=800
2. in the bushes 在灌木丛中。
3. leave “ 使。。。” 使役性动词， 用法为：leave sth. doing /done
如：he left his house, leaveing the door open.
leaving his body exposed 和leaving the door open 都是现在分词短语作伴随状语。
his body exposed 身体是被暴露在外面的,所以用被动exposed
子弹呼啸而过，是主动不是被动所以用ing形式
bullets发出的，是主动，+ing 后面的by是方位词是经过的意思 又如fly by
in 动词+名词+in
动词+into+名词
因为whistling与 bullets是主动关系 by后面其实省略了the timid fellow 这个by是指子弹在the timid fellow身边呼啸而过
把句子拆开看
sb be frightened by sth (这里的sth就是指“the bullets_________”）
bullets whistling by sb
这是个状语的问题。
关键你要搞清楚主动被动的关系。
比如第一格，主语是the bullets（子弹），它和whistling by（呼啸而过）是主动的关系，即的确是：子弹呼啸而过，所以用ing形式 whistling by。
而第三格主语是fellow（人）是他把他的身体暴露在外的，所以也是主动的，所以用leaving.... 但是body（身体）和 expose（暴露）的关系是被动的。身体是被暴露在外面的，所以用被动exposed.
至于hide his head in the bushes是因为句意的关系，把他的头藏在树林里啦。
是子弹whistle,所以用主动,ing形式;那个胆小的家伙把他的头藏在灌木中,所以用in;是那个家伙离开(leave),又是主动,所以是leaving。
综上所述，选C
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