Though and although- have meaning as ‘despite’. ‘Although’ is preferred at beginning of the sentence and ‘though’ is preferred in middle of the sentence; ‘though’ can be used at the end of the sentence; ‘although’ cannot be used at end of the sentence,
翻了牛津词典，chance的定义是a possibility of sth happening, especially sth that YOU WANT, 这里death和risk搭配要合适一些
half...as those/than those -- non-idiomatic
B&C中的do虽然没有错但是wordy
O Acid => Quality; O acid => Acidity. B and C are both inaccurate. However, B said that measuring the acidity is the only way. We don't know if it is the only way. So, finally the answer is C.
action of hurting is in present progressive tense and hence, means that it is an ongoing action, while the verb raised is in simple past tense. This is illogical since result cannot precede the cause. Therefore, we have a verb tense error in this sentence.
1、真正的考点是can vs. could. 本题的whale有能力是一个客观事实用can（ability），这点从foraging和interspersing看出。Could有possibility的意思，还有说could过去有这种能力，现在没有的意味。
2、As much as一般用于肯定句，so much as 一般用于否定。
though+noun is used to show a physical subject through which something is done. the signal run through the cable. through +noun can be used with a verb of moving. I swim /go through the watter. both cases are not logic inhere.
In experiments = Full, stand-alone experiments (from start to finish) were dedicated to finding a cure for cancer by giving mice bone marrow
Through experimenting/experimentation = Not clear if done as a stand-alone experiment, or done informally outside of a formal experiment process
不能选B，只能选D。因为，第二句：Edith Abbott was convinced that ... and that students could be offered a broad range of courses dealing with social issues 缺成分。EA被说服了 （谁） 可以为学生提供广泛的社会问题课程。所以第二句不能构成并列的宾语从句，只能充当主句里宾语从句的where地点状语从句，修饰前面的university。
B. Edith Abbott was convinced that 宾语从句A, and that 宾语从句B (错误)
D. Edith Abbott was convinced that 宾语从句A， where 地点状语从句 a1 (正确)
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Though and although- have meaning as ‘despite’. ‘Although’ is preferred at beginning of the sentence and ‘though’ is preferred in middle of the sentence; ‘though’ can be used at the end of the sentence; ‘although’ cannot be used at end of the sentence,