To Section A
1.reward n. sth. received in return for work or services他因表现勇敢而取得了一枚奖章。 He received a medal as a reward for his bravery. rewarding a. worth doing,              satisfyingTeaching is a rewarding  career. 教学是一项很有意义职业。
2. frustrate v. ① to cause sb. to feel angry or disappointed She was frustrated by her failure in the college entrance exam.  她因高考失利而气馁丧气。近义、同义词discourage; disappoint;upset; annoy discourage sb. from doing sth. 阻拦；阻止