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【单选题】
Ellen's best friend gave her a set of tools because Ellen______.A.
wants to use them every week
B.
wants to replace her husband's tools
C.
is poor at using her husband's tools
D.
is good at using tools
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反馈参考答案：
举一反三
【单选题】Which of the following underlined parts is different in pronunciation from others?
A.
Tom’s dr ea m is to work in a hospital.
B.
There must be a r ea son for his success.
C.
Go ah ea d! Take what you want.
D.
The sand on the b ea ch is very hot.
【判断题】内标法具体做法是：准确称取样品，加入一定量选定的纯物质作为内标物，然后注入色谱仪进行色谱分析，再由被测物和内标物在色谱图上相应的峰面积(或峰高)和相对校正因子，求出待测组分的含量。
A.
正确
B.
错误
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