Students should make better choices when it comes to eating. They should not eat pizzas or sandwiches.
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The good news is that the Freshman 15 is not true at all. No freshman gains any weight.
A. 对
B. 错
众所周知的泰坦尼克号船钢板由于含________较高，韧性较差，尤其是低温下呈现脆性，给整只船的寿命带来致命性影响。
A. N
B. C
C. S
D. P
相比较而言，硅太阳能电池具有____________________优势。
A. 工艺成熟
B. 资源丰富
C. 环境友好
D. 电池效率高
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