题干

在“观察人的口腔上皮细胞的实验”中,下列的操作正确的是(  )

A:制作临时装片时在载玻片中央滴一滴清水

B:对光时,显微镜视野太暗,可以把凹面镜换成平面镜

C:下降显微镜的镜筒时,眼睛要注视物镜

D:物象在视野的左上方,应将装片向右下方移动

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答案(点此获取答案解析)

C

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    Guided Walking Week April 2018

    Date: April 30th—May 7th 2018

    Location: Abdet, Costa Blanca

    A week of guided walking in the mountains around Abdet. Highlights include the climbing of Valencia's highest summit (Sierra de Aitana),traveling completely around the impressive Puig Campana, and several explorations in the Sierra de Aitana. Ancient trails lead through spectacular canyons (峡谷) to abandoned settlements situated high in the mountains. You will discover the snow trader routes which lead from the incredible snow holes high in the mountains down to the villages and towns on the coast. These years, golden eagles have made a return to this area, and you may also see other animals—wild goats, foxes, wild pigs and red squirrels.

    As part of the week you are invited to help clear some local walking paths. This involves clearing collapsed walls and rocks, cutting back fallen trees. This is of course optional and is just for half a day, and it's actually great fun!

Price: $499

Includes:

    Accommodation in the beautiful mountain village of Abdet

    All food—good home cooking

    Beer, wine, soft drinks Snacks and post walk treats

    Packed lunches & drinks (except café/bar visits)

    Expert guiding

    Photos/Videos of your days in the mountains

    Airport pick-up/return $25 each way (fly to Alicante)

    Single room supplement $75

    To book or get further information, please contact info@abdct.com.