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【单选题】
根据下面的图示，判断说法正确的一组是（ ）A.
图一所示图“大气”的成分是氧气，生态系统中的能量流动方向是动物到植物、微生物到动物、微生物到植物
B.
图二表示用显微镜观察洋葱鳞片叶的表皮细胞．第一次看到的物像如⑤所示，装片下方移动后才能达到⑥的效果．此时显微镜目镜和物镜的读数分别是10×和10×表示这些细胞被放大了10倍
C.
图三是一个肾单位的结构模式图，①与④内两种液体相比，④内液体中不含葡萄糖⑧与④内两种液体相比，⑧内液体中不含尿素等废物
D.
图四为肺泡内的气体交换示意图（a、b表示血管，箭头表示血液流动方向）．a为肺动脉，其内流静脉血．b为肺静脉，其内流动脉血．b内血液将流回心脏的左心房
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【单选题】Professional and skilled as she is in drama, there are ______ when she can make some funny mistakes while acting in a movie.
A.
situations
B.
occasions
C.
scenes
D.
conditions
【单选题】_____ yourself stand out at a party, you should play some funny games.
A.
Having made
B.
Make
C.
Making
D.
To make
【单选题】Some people think clowns are only funny for children. _____, they can help people forget their problems, at least for a short moment. [ ]
A.
Actually
B.
Especially
C.
Probably
D.
Surely
【单选题】It’s very funny that many people who lose weight gain it back after some time and end up back __________ they started.
A.
when
B.
after
C.
since
D.
where
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