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【单选题】
有地下雪梨美名的是A.
地瓜
B.
雪莲果
C.
荸荠
D.
红薯
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反馈参考答案：
举一反三
【单选题】以下关于凝固点降低常数叙述正确的是( )。
A.
凝固点降低常数与溶剂的本性有关。
B.
相同溶剂不同溶质时其凝固点降低常数不同。
C.
溶质的质量摩尔浓度影响凝固点降低常数。
D.
溶液的凝固点降低值影响凝固点降低常数。
【单选题】What was the author's purpose when writing this passage?
A.
To discuss different methods of pruning.
B.
To introduce some common knowledge of pruning.
C.
To explain how trees develop disease.
D.
To give practical instruction for pruning a tree.
【单选题】Which of the following traits is NOT influenced by your genes?
A.
how easily you develop disease
B.
how long you live
C.
some of the ways you behave
D.
which foods you like to eat
【单选题】Section B Directions: In this section, you will hear 3 short passages. At the end of each passage, you will hear some questions. Both the passage and the questions will be spoken only once. After you ...
A.
A comparison between the poorest countries and richest countries.
B.
An aid for health care to developing countries.
C.
The relationship between health care and economic growth.
D.
The investment in developing countries.
【单选题】下列物质中能用氢氧化钠标准溶液直接滴定的是（ ）[Ka（苯酚＝1.1×10-10）；Kb（NH3）＝1.8×10-5；Ka（HAc）＝1.8×10-5；草酸：Ka1＝5.9×10-2，
A.
苯酚
B.
氯化氨
C.
醋酸钠
D.
草酸
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