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【判断题】
未成熟的西红柿不能生吃，因其含有毒物质“番茄碱”。A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】The description of a language at some point in history is called a______study.
A.
prescriptive
B.
synchronic
C.
descriptive
D.
diachronic
【单选题】The description of a language as it changes through time is a______ study.
A.
prescriptive
B.
descriptive
C.
synchronic
D.
diachronic
【简答题】按重量计算含磷为16％的铜母合金答案：28480000
【单选题】Based on the description of a lahar deposit, how do clasts and matrix particles differ in size?
A.
Any clast is larger than the largest matrix particle.
B.
Any clast is smaller than the smallest matrix particle.
C.
Some, but not all, clasts are smaller than the largest matrix particle.
D.
Some, but not all, matrix particles are larger than the smallest clast.
【判断题】The description of a language at some point of time in history is a diachronic study ,but the description of language as it changes though time is a synchronic
A.
正确
B.
错误
【单选题】铝热反应常用于冶炼或焊接金属，其反应原理可表示为3CuO+2Al?3Cu+Al 2 O 3 ．现将一定量铝粉和氧化铜混合加热，充分反应后停止加热．为了检验氧化铜是否有剩余，取少量反应后的固体，加入足量稀硫酸，反应后将铁片插入上层溶液中．下列叙述的现象，能够说明氧化铜有剩余的是（ ）
A.
加热反应结束后有红色物质生成
B.
加入稀硫酸后，有气泡生成
C.
加入稀硫酸后，没有气泡生成
D.
插入溶液中的铁片表面有红色物质生成
【单选题】The description of a language at some point of time in history is a study; the description of a language as it changes through time is a historical study.
A.
diachonic
B.
synchronic
C.
traditional
D.
modern
【简答题】The description of a language at some point of the time in history is a _________ study ; the description of a language as it changes through time is a _________ study.
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