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【单选题】
加热器端差增大，表明加热器运行经济性（）。A.
好
B.
变差
C.
未变化
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【简答题】Why is adolescence called 'plastic age' in this passage?
【单选题】有关骨骼肌的叙述正确的是（ ）
A.
骨骼肌由肌腹和肌腱两部分组成
B.
骨骼肌的收缩和舒张既能牵拉骨又能推开骨
C.
骨骼肌的收缩和舒张不需要神经系统的控制和调节
D.
肌腱将一块骨骼肌固定在同一块骨上
【简答题】按照 TCP/IP 网络体系结构,网络划分为四个层次,分别是 ___________ 层、 ___________ 层、传输层和应用层 。
【单选题】下列关于骨骼肌的结构的说法正确的是（ ）
A.
骨骼肌由两端的肌腹和中央的肌腱构成
B.
骨骼肌由两端的肌腱和中央的肌腹构成
C.
骨骼肌由两端的血管和中央的肌腹构成
D.
骨骼肌由两端的神经和中央的肌腱构成
【简答题】Why are plastic surgery so popular among those young girls?
【简答题】哺乳动物的骨骼肌由 和 组成，它受 的调节和控制。环节动物蚯蚓体内有肌肉，但没有 ，以至于它不能 运动。
【简答题】听下面一段材料,回答第1-3题。 1. Why is the British government planning to tax plastic bags? A. To go with the rules in Ireland. B. To make them not too expensive. C. To reduce the amount of rubbish. 2. In which c...
【单选题】Which sentence from the section "Giant Plastic Scooper" explains why trash is a problem in the ocean?
A.
It scoops plastic out of rivers as it drifts past.
B.
The machine is powered by the sun.
C.
Plastic bottles, bags and toys are a few examples of the trash.
D.
For example, whales might eat the plastic and die.
【单选题】Why is Lego trying to reuse its plastic Legos?
A.
because materials for making plastic are hard to find
B.
because plastic is not safe for kids to play with
C.
because plastic is expensive to make
D.
because plastic is bad for the environment
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