請教幾題英文用字的問題，請英文高手幫忙

Question

請大大幫我解答下面幾題選擇題...
可以的話說一下為什麼你那樣選~

1. A: Steve’s better today.
B: Oh? I wasn’t _______ that he’d been sick.
(A)aware (B)familiar (C)knowing (D)known

2. Look what you have done! you’ve _______ poor little Mary, and she’s crying.
(A)set up (B)spoilt (C)upset(D)upside down

3. Norah’s very shy. When a man speaks to her, she blushes bright _______ .
(A)colour (B)saucer (C)scare (D)scarlet

4. Many people seem _______ that the world could be destroyed by man.
They don’t want to think about the danger.
(A)incapable (B)unaware (C)unconscious (D)unexpected

5. New treatments for diseases are continually appearing as a result of medical ______ .
(A)examinations (B)inquiries (C)research (D)searches

6. In ancient Rome, many laws were not made democratically.
Emperors just made laws by _______ .
(A)command (B)decree (C)degree (D)rule

7. On trains, there’s an employee called a _______ who’s very
helpful to the passengers.
(A)composer (B)conductor (C)director (D)leader

我的問題是
第3題爲什麼不選A
第4題爲什麼不選C??
請知道的大大回答~

Answer 1

既然你已經有題目了，我還是建議你對每個選項的生字都查字典，把這些單字變成自己的，以後也可以來回答別人。

答案如下～
1. A: Steve’s better today.
B: Oh? I wasn’t _______ that he’d been sick.
(A)aware （意識到）

2. Look what you have done! you’ve _______ poor little Mary, and she’s crying.
(C)upset（使心煩意亂）

3. Norah’s very shy. When a man speaks to her, she blushes bright _______ .
(D)scarlet（緋紅色）
不選(A)colour的原因是，題意明顯已經在期望你填入一樣顏色，而不是再說一次colour這個名詞。簡單一點來說，直接翻譯來聽就知道是否合理：
「她的臉紅了起來（blushes bright scarlet）」
「她的臉『顏色』了起來（blushes bright colour）」明顯句意不對

4. Many people seem _______ that the world could be destroyed by man.
They don’t want to think about the danger.
(B)unaware（沒有意識到）
不選(C)unconscious的原因在於你沒有弄清楚字意，說到一個人有沒有『意識』到某事，用aware或unaware；若是說到他還有沒有『意識』，當然就是說他conscious或unconscious囉。這個問題是問到多數人沒有意識到也成為毀滅地球得幫凶，所以要用unaware。

5. New treatments for diseases are continually appearing as a result of medical ______ .
(C)research（研究）

6. In ancient Rome, many laws were not made democratically.
Emperors just made laws by _______ .
(A)command（命令）

7. On trains, there’s an employee called a _______ who’s very
helpful to the passengers.
(B)conductor（火車車掌）